The U.N. chief’s special adviser on genocide prevention Wednesday warned of a “high risk of crimes against humanity and of genocide” in the Central African Republic (CAR).Adama Dieng and other U.N. officials briefed the Security Council on the continuing and unprecedented violence in one of the world’s poorest countries.The officials spoke of children being beheaded and of entire villages burned, and they urged the deployment of more peacekeepers as soon as possible.But they expressed hope at this week’s election of an interim president who is the first female leader in the country’s history, and at the $496 million in humanitarian assistance newly pledged by international donors.